#Manual partitions for Kubuntu install: executing grub-install /dev/sda failed

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candid zinc
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I'm testing Kubuntu installation on VirtualBox (50GB disk) with manual partitioning.
By default Kubuntu doesn't have a preset for separate root and home partitions. So I'm using KDE Partition Manager before installation:
I made:
/dev/sda1 - fat32 EFI partition.
/dev/sda2 - LVM2 pv partition.
Then I made new volume group on /dev/sda2 called vg0.
In that volume group I created:
/dev/vg0/home - ext4 - 22GB
/dev/vg0/root - ext4 - 25GB
/dev/vg0/swap - linuxswap - 3GB
Then I launch installer, choose /dev/vg0/home as /home, /dev/vg0/root as /, /dev/vg0/swap as swap and /dev/sda as disk that has boot partition.
And as a result I get: executing grub-install /dev/sda failed

I guess I messed up somewhere with EFI partition. But search results in Google tell to do just what I did

delicate mauve
#

Then I complain to the author who wrote the article.